normal align=center>温石棉纤维长度分级标准及纤维组成

normal align=center>等级或

normal align=center>级别

normal align=center>平均纤维长度不小于mm

normal align=center>平均纤维含量%

normal align=center>干式分级%

normal align=center>含砂量不大于%

normal align=center>夹杂物含量 %

normal align=center>不大于

normal align=center>不小于

normal align=center>不大于

normal align=center>+12.5mm

normal align=center>+4.75mm

normal align=center>+1.4mm

normal align=center>满底

normal align=center>手选1级

normal align=center>19

normal align=center>60

normal align=center> 

normal align=center> 

normal align=center> 

normal align=center> 

normal align=center>5.0

normal align=center> 

normal align=center>手选2级

normal align=center>9

normal align=center>60

normal align=center> 

normal align=center> 

normal align=center> 

normal align=center> 

normal align=center>10.0

normal align=center> 

normal align=center>机选3级

normal align=center> 

normal align=center> 

normal align=center>12～65

normal align=center>24～55

normal align=center>8～25

normal align=center>3～8

normal align=center>0

normal align=center>0.04

normal align=center>机选4级

normal align=center> 

normal align=center> 

normal align=center>0

normal align=center>10～60

normal align=center>30～70

normal align=center>10～20

normal align=center>0.3

normal align=center>0.04

normal align=center>机选5级

normal align=center> 

normal align=center> 

normal align=center>0

normal align=center>0

normal align=center>50～80

normal align=center>20～50

normal align=center>0.5

normal align=center>0.02

normal align=center>机选6级

normal align=center> 

normal align=center> 

normal align=center>0

normal align=center>0

normal align=center>20～40

normal align=center>60～80

normal align=center>1.0

normal align=center>0.02